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runtime: add support for --buildmode=c-shared on loong64
These c-shared related CLs are follow up of CLs 455016, 455017, 455018. Here we follow the LoongArch ELF psABI v2 standard, which requires the support of the PCALAU12I instruction. Updates #53301 Updates #58784 Change-Id: I7f1ddbf3b2470d610f12069d147aa9b3a6a96f32 Reviewed-on: https://go-review.googlesource.com/c/go/+/425474 Reviewed-by: abner chenc <chenguoqi@loongson.cn> Reviewed-by: WANG Xuerui <git@xen0n.name> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Michael Knyszek <mknyszek@google.com> Run-TryBot: Ian Lance Taylor <iant@google.com> Auto-Submit: Ian Lance Taylor <iant@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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@ -3,6 +3,7 @@
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// license that can be found in the LICENSE file.
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#include "textflag.h"
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#include "cgo/abi_loong64.h"
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TEXT _rt0_loong64_linux(SB),NOSPLIT|NOFRAME,$0
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// In a statically linked binary, the stack contains argc,
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@ -13,6 +14,56 @@ TEXT _rt0_loong64_linux(SB),NOSPLIT|NOFRAME,$0
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ADDV $8, R3, R5 // argv
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JMP main(SB)
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// When building with -buildmode=c-shared, this symbol is called when the shared
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// library is loaded.
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TEXT _rt0_loong64_linux_lib(SB),NOSPLIT,$168
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// Preserve callee-save registers.
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SAVE_R22_TO_R31(3*8)
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SAVE_F24_TO_F31(13*8)
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// Initialize g as nil in case of using g later e.g. sigaction in cgo_sigaction.go
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MOVV R0, g
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MOVV R4, _rt0_loong64_linux_lib_argc<>(SB)
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MOVV R5, _rt0_loong64_linux_lib_argv<>(SB)
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// Synchronous initialization.
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MOVV $runtime·libpreinit(SB), R19
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JAL (R19)
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// Create a new thread to do the runtime initialization and return.
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MOVV _cgo_sys_thread_create(SB), R19
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BEQ R19, nocgo
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MOVV $_rt0_loong64_linux_lib_go(SB), R4
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MOVV $0, R5
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JAL (R19)
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JMP restore
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nocgo:
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MOVV $0x800000, R4 // stacksize = 8192KB
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MOVV $_rt0_loong64_linux_lib_go(SB), R5
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MOVV R4, 8(R3)
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MOVV R5, 16(R3)
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MOVV $runtime·newosproc0(SB), R19
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JAL (R19)
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restore:
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// Restore callee-save registers.
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RESTORE_R22_TO_R31(3*8)
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RESTORE_F24_TO_F31(13*8)
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RET
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TEXT _rt0_loong64_linux_lib_go(SB),NOSPLIT,$0
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MOVV _rt0_loong64_linux_lib_argc<>(SB), R4
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MOVV _rt0_loong64_linux_lib_argv<>(SB), R5
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MOVV $runtime·rt0_go(SB),R19
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JMP (R19)
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DATA _rt0_loong64_linux_lib_argc<>(SB)/8, $0
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GLOBL _rt0_loong64_linux_lib_argc<>(SB),NOPTR, $8
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DATA _rt0_loong64_linux_lib_argv<>(SB)/8, $0
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GLOBL _rt0_loong64_linux_lib_argv<>(SB),NOPTR, $8
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TEXT main(SB),NOSPLIT|NOFRAME,$0
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// in external linking, glibc jumps to main with argc in R4
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// and argv in R5
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